Dial-lock



R. C. LEWIS.

DIAL LOCK. APPLICATION FILED MAR. 25, 1921.

1,395,844. Patented Nov. 1, 1921.

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ROLLIN G. LEWIS, OF STAMFORD, CONNECTICUT,.ASSIGNUR TO THE YALE & TOWNEMANUFACTURING CQMPAHY,

0F STAMFORD, CONNECTICUT.

DIALLOCK.

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Specification of Letters l atent.

Patented Nov. 1, 1921.

7 Application filed March 25, 1921. Serial No. 455,465.

To all whom it may concern:

Be it known that I, RoLLIN C. LEWIS, a citizen of the United States, anda resident of Stamford, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inDial-Locks; and I do hereby declare thefollowing to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in dial locks in which aspindle connects the dial with the disk tumbler driving cam.

One method of attacking such a lock is to remove the dial and drive thespindle inwardly to force the driving cam against the tumblers carriedby the curb and thus detach the curb and its associated tumblers.

The object of the invention is to so connect the spindle and drivingcam, that any force applied to the spindle tending to drive it inwardly,will disconnect it from the cam thus making it impossible to actuate thetumblers from the outside.

With this object in view my invention consists in the parts andcombination of parts as will be more fully explained and pointed out inthe claims.

In the accompanying drawings, Figure 1 is a view in section through alock case showing the tumbler, driving cam and part of the spindle; Fig.2 is a View in elevation of the spindle and driving cam and Fig. 3 is aview showing the spindle disconnected from the driving cam.

5 represents the lock case, 6 the curb having a centrally located sleeve7 on which the tumblers 8 are mounted and secured and 9 is the drivingcam adapted to drive or turn the tumblers 8 in the usual and well knownmanner. This driving cam is provided with a centrally located hollow hubprovided internally with teeth extending lengthwise thereof and adaptedto intermesh with similarly arranged teeth 10 formed at the front end ofthe cam center 11, as shown in Fig. 3. This cam center 11 is screwed andkeyed to the spindle 12 so that it turns with the latter, and thespindle is in turn designed to be connected at its outer end with adial, not shown.

With this construction it will be seen that, when the spindle is turnedby the dial, the

driving cam will be turned with the same and manipulate the tumblers inthe ordinary and well known manner to release and retract the bolt. Ifhowever an attempt be made to open the door by removing the dial andforcing the spindle rearwardly, whlch is one method of attacking locksof this type, the spindle will be forced out of engagement With thedriving cam thus leaving the latter idle or floating and incapable ofactuating the tumblers and destroying all means of operating the look.

In order to prevent the curb from being dislodged by the spindle, Iprefer to provide the curb with an opening in line with the sleeve 7 andspindle, which hole is normally closed by a cap 7 held in place byfriction.

With this construction it will be seen that if the spindle be drivenback to the curb it will dislodge the cap and pass through withoutdetaching the curb.

It is evident that changes may be mar-W in the details without departingfrom the spirit of my invention which consists of means connecting thedriving cam and spindle, so that in the event any attempt be made torelease the bolt by forcing the spindle inwardly, the spindle will bedisengaged from the driving cam thus leaving the latter in position toprevent the operation of the fence.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is

1. In a dial lock, the combination of a spindle, tumblers and a drivingcam for the tumblers, the spindle and cam having interlockingconnections whereby the cam will be rotated by the spindle, but will bedisconnected therefrom when the spindle is forced inwardly.

2. In a dial lock, the combination of a spindle, tumblers and a drivingcam, the

cam and spindle having intermeshing prodisconnected therefrom if thespindle be forced inwardly.

4. In a dial lock, the combination of a spindle, tumblers, a driving camfor the 5 latter, and a cam center rigidly secured to the inner end 01":the spindle, the said cam center provided at its front end with teethadapted to intermesh with similarly shaped v teeth in the hub of thecam, whereby the lat- 10 ter may be rotated by the spindle, but will bedisconnected from said spindle if the latter be forced inwardly.

In testimony whereof, I have signed this Witnesses. V

JULIUS A. WEsT, CHARLES A, BERRY.

